JDK8 stream用法

1，两个list合并成map

import com.alibaba.fastjson.JSONObject;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


JSONObject jsonObject = JSONObject.parseObject("{"value":"1,2,3","label":"a,b,c"}");
List idArr = Arrays.asList(((String) jsonObject.get("value")).split(","));
List nameArr = Arrays.asList(((String) jsonObject.get("label")).split(","));
Map map = idArr.stream().collect(Collectors.toMap(key -> key, key -> nameArr.get(idArr.indexOf(key))));
System.out.println("jsonObject:"+jsonObject);
System.out.println("map:"+map);